Harman Kardon AVR 75 (serv.man2) Service Manual ▷ View online
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Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
37. DVD Inputs: Connect the analog audio outputs and
composite or S-Video output of a DVD or LV player to these
jacks.
38. TV Inputs: Connect these jacks to the audio and video
outputs of a TV Tuner, Cable TV converter box, satellite
receiver, or any other audio/video source.
39. Pre-Outs: If external power amplifiers are used for any
channels, connect them to these jacks.
40. Subwoofer Pre-Out: Connect this jack to the line level
input of a powered subwoofer. If an external subwoofer
amplifier is used, connect this jack to the subwoofer
amplifier input.
41. Center: Connect these terminals to the center speaker.
42. Surround: Connect these terminals to the surround
speakers.
43. Front: Connect these terminals to the front speakers.
44. Switched AC Outlet: This outlet may be used to power
any device that you any wish to have on when the unit is
turned on.
45. Unswitched AC Outlet: This outlet, may be used to
power any AC device. The power will remain on at this
outlet regardless of whether the AVR75/85 is on or off.
NOTE: The power consumption of the device plugged into
each of these outlets should not exceed 120 watts.
46. Power Cable: Connect the AC plug to a non-switched
AC wall output.
47. AC-3/PCM Optical Input: Connect the optical digital
output from a DVD player, HDTV receiver, LV player or CD
player to this jack. The signal may be either a Dolby Digital
(AC-3) signal or a standard PCM digital source.
48. AC-3/PCM Coaxial Input: Connect the coax digital
output from a DVD player, HDTV receiver, LV player or CD
player to this jack. The signal may be either a Dolby Digital
(AC-3) signal or a standard PCM digital source.
49. AC-3 RF Input: Connect the AC-3 RF output of an LV
player equipped for digital audio to this jack.
NOTE: Do not connect standard analog sources to these
jacks (48)(49).
50. Remote IR In: If the AVR75/85’s front panel IR sensor is
blocked due to cabinet doors or other obstructions, an
external IR sensor may be used. Connect the output of the
sensor to this jack.
51. Remote IR Out: This connection permits the IR sensor
in the receiver to serve other remote controlled devices.
Connect this jack to the “IR IN” jack on Harman Kardon or
other compatible equipment.
52. VCR 1 Inputs: Connect these jacks to the audio, video
and S-Video PLAY/OUT jacks of a VCR.
53. VCR 1 Outputs: Connect these jacks to the audio,
video and S-Video RECORD/IN jacks of a VCR.
54. TV Monitor S-Video Output: Connect this jack to the
S-Video input of the TV monitor or video projector to view
S-Video sources selected by the receiver’s video switcher.
NOTE: Standard (composite) video and S-Video signals will
appear only at their respective output. The AVR75/85 does
not convert one video format to anther.
55. TV Monitor Video Output: Connect this jack to the
standard (composite) video input of a TV monitor or video
projector to view the on-screen menus and the output of any
standard video source selected by the receiver’s video
switch.
56. VCR 2 Outputs: Connect these jacks to the audio,
video and S-Video RECORD/IN jacks of a second VCR.
57. VCR 2 Inputs: Connect these jacks to the audio, video
and S-Video PLAY/OUT jacks of a second VCR.
58. Multiroom Audio Outputs: Connect these jacks to the
optional audio power amplifier that powers remote room
speakers with the input selected by the multiroom control
system. This feature is found only on the AVR85.
59. Multi IR: Connect the output of an IR sensor in a remote
room to this jack to operate the AVR85’s multiroom control
system. This feature is found only on the AVR85.
Service Bulletin #9705 for AVR85
Service bulletin # 9705 August 1997
To: All harman/kardon Service Centers
Models: AVR85
Subject: No audio output
In the event you receive an AVR85 with the complaint “no audio output” (even though the display is
lit up normally), perform the necessary steps listed below:
PROCEDURE:
1)
Make sure the receiver is OFF and unplugged; remove the top cover of the unit.
2)
Position the unit on its side, facing it so you are looking at the bottom cover, with the front of the receiver
facing left. The power transformer should be down, or nearest the work bench.
3)
Remove the front right “foot” of the unit; then with a sharp pair of dikes or wire cutters cut the (16) metal
connections on the bottom screen attaching it to the bottom cover. Remove bottom screen from unit; for
safety continue to cut all the remaining severed metal tabs from the bottom cover.
4)
Locate and discharge main power supply electrolytic capacitors C802 & C803 with a 10 ohm, 10 watt resistor.
At this point, C802 & 803 are at the top of the main PCB; The two leads to C803 can be identified by the
marking “-B” on the PCB; C802 is just above it. After discharge, check with voltmeter that capacitors have
less than 1 volt DC across leads to confirm that discharge is complete.
5)
See drawing; locate two areas of a poor solder connection due to an unintended mask, or dark-colored dot
that is partially covering the solder pad(s) where the leads come through. Unsolder the connection(s) with
solder wick. Clean & scrape, if necessary, with a small screwdriver the foil/pad area thoroughly and remove
any excess mask residue. Re-solder the connection(s) carefully to assure good connections.
6)
Turn the unit upright; locate PCB P714, the small vertical circuit board nearest the main heatsink. Unplug
and remove small molex connector J701 at the top of the board; then remove the four mounting screws and
metal tabs holding the top of the board in place.
7)
Remove the two locks to the two sockets, J714 and J716. Take care not to damage the lock or connector
while attempting to unlatch the PCB; then unplug and remove the entire PCB P714.
8)
Locate 10 ohm, ¼ watt resistors RH23, RH24, R745, R746, R747, R748; test with multimeter to assure they
are still 10 ohms +/- 5%. If values are different (indicating damage), replace as necessary.
9)
Return PCB P714 to unit; re-attach molex connector; replace 4 screws and mounting tabs. Replace top cover
of receiver.
10)
Re-attach the bottom screen to the bottom cover using 12 screws, (H/K# 51260306MO); the screen will be
upside-down compared to its former position when attached; replace the unit’s “foot”.
11)
TO TEST:
a) Plug in the unit; connect speakers to left, right, and center output terminals.
b) Turn the unit on; switch the unit to “Prologic” mode by use of the mode buttons on the front panel.
c) Press the button “TEST TONE” on the remote control. The display should read “FRONT L” and “TEST”
should flash.
d) Adjust the master volume, and verify test noise is heard from front left channel.
e) Press the button “CH SELECT” on the remote control to change to the right and center speakers, and
verify test noise is heard from each one.
f) Press the button “TEST TONE” on the remote control again to exit the test.
Model
Serial number
120V
Serial number
230V
Status
Action
AVR85
MJ0011-01001
to
MJ0011-02500
MJ0012-01001
to
MJ0012-01500
Poor connections in
two areas on main
PCB
Clean & re-solder connections, check
or replace RH23,RH24,R745.R746,
R747, R748 if necessary
AVR85
MJ0011-02501 and
above
MJ0011-01501 and
above
Modified by factory
NONE REQUIRED
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Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
1 5
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
View is upper left-hand corner of PCB
Bottom (trace) side
CONNECTION #1
CONNECTION #2
SERVICE AND ADJUSTMENT
I. SERVICE PROCEDURE
1.Tracking Point Memory
This service procedure can be used for measurement of the tuner circuit. With the POWER ON, press the “PRESET UP”
button while pressing the “MEMO” button for at least 3 seconds or more. FLD will display “TRACKING”. Frequencies to be
memorized are as follows:
VERSION
P1
P2
P3
P4
FM
US, Europe.
90.0
98.0
106.0
87.5
SCAN STEP
P5
P6
P7
P8
P9
P10
P11
P12~P30
AM
10 KHz
600.0
1000.0
1400.0
520.0
9 KHz
603.0
999.0
1404.0
531.0
MW/LW
171.0
207.0
270.0
152.0
531.0
2. FLD Segment Illumination
This service procedure will illuminate all segments by the following step: With the POWER ON, press the “FM/AM (TUNER)”
button while pressing the “MODE” button for at least 3 seconds or more. This procedure takes 1 minute and 40 seconds to
finish; at this point the procedure is complete.
Sequence
1. All segments will be illuminated for 5 seconds.
2. At the grid “1G”, segments are illuminated in the following order:
3. At the grid “2G” to “11G”, each segment is illuminated individually:
4. At the grid “12G”, segments are illuminated in the following order:
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Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
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